Thanks fellows for all the input. I ended up getting them from Daniel at Z1 Motorsports. Those guys always have the best pricing and customer service. According to them this is a very familiar problem. I should have the Z back on the road no later than Monday evening!!
As far as Nissan and there high dollar O2 sensors they can go f*#k them selves. Oh well we live and learn. Hope this thread helps others from making the same mistake in their future build ups.